513 lines
7.6 KiB
C++
513 lines
7.6 KiB
C++
#include <errno.h>
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#include <fcntl.h>
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#include <stdarg.h>
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#include <stdio.h>
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#include <string.h>
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#include <sys/syscall.h>
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#include <unistd.h>
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struct FILE
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{
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int fd { -1 };
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off_t offset { 0 };
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bool eof { false };
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bool error { false };
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unsigned char buffer[BUFSIZ];
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uint32_t buffer_index { 0 };
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};
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static FILE s_files[FOPEN_MAX] {
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{ .fd = STDIN_FILENO },
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{ .fd = STDOUT_FILENO },
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{ .fd = STDERR_FILENO },
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};
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FILE* stdin = &s_files[0];
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FILE* stdout = &s_files[1];
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FILE* stderr = &s_files[2];
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void clearerr(FILE* file)
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{
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file->eof = false;
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file->error = false;
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}
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char* ctermid(char* buffer)
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{
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static char s_buffer[L_ctermid];
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char* target = buffer ? buffer : s_buffer;
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syscall(SYS_TERMID, target);
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return target;
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}
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int fclose(FILE* file)
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{
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if (int ret = syscall(SYS_CLOSE, file->fd) < 0)
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{
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errno = -ret;
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return EOF;
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}
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file->fd = -1;
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return 0;
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}
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// TODO
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FILE* fdopen(int, const char*);
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int feof(FILE* file)
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{
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return file->eof;
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}
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int ferror(FILE* file)
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{
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return file->error;
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}
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int fflush(FILE* file)
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{
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if (file == nullptr)
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{
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for (int i = 0; i < FOPEN_MAX; i++)
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if (s_files[i].fd != -1)
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if (int ret = fflush(&s_files[i]); ret != 0)
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return ret;
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return 0;
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}
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if (file->buffer_index == 0)
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return 0;
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if (long ret = syscall(SYS_WRITE, file->fd, file->buffer, file->buffer_index); ret < 0)
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{
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errno = -ret;
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file->error = true;
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return EOF;
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}
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file->buffer_index = 0;
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return 0;
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}
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int fgetc(FILE* file)
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{
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if (file->eof)
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return EOF;
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unsigned char c;
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long ret = syscall(SYS_READ, file->fd, &c, 1);
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if (ret < 0)
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{
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errno = -ret;
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return EOF;
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}
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else if (ret == 0)
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{
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file->eof = true;
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return EOF;
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}
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file->offset++;
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return c;
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}
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int fgetpos(FILE* file, fpos_t* pos)
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{
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*pos = file->offset;
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return 0;
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}
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char* fgets(char* str, int size, FILE* file)
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{
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if (size == 0)
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return str;
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int c = fgetc(file);
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if (c == EOF)
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return nullptr;
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str[0] = c;
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for (int i = 1; i < size - 1; i++)
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{
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str[i] = fgetc(file);
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if (str[i] == EOF)
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{
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str[i] = '\0';
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return nullptr;
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}
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if (str[i] == '\n')
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{
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str[i + 1] = '\0';
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return str;
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}
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}
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str[size - 1] = '\0';
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return str;
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}
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// TODO
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int fileno(FILE*);
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// TODO
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void flockfile(FILE*);
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FILE* fopen(const char* pathname, const char* mode)
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{
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uint8_t flags = 0;
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if (mode[0] == 'r')
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flags |= O_RDONLY;
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else if (mode[0] == 'b')
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flags |= O_WRONLY | O_CREAT | O_TRUNC;
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else if (mode[0] == 'a')
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flags |= O_WRONLY | O_CREAT | O_APPEND;
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else
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{
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errno = EINVAL;
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return nullptr;
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}
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if (mode[1] && mode[2] && mode[1] == mode[2])
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{
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errno = EINVAL;
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return nullptr;
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}
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for (int i = 1; i <= 2; i++)
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{
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if (mode[i] == 0)
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break;
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else if (mode[i] == '+')
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flags |= O_RDWR;
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else if (mode[i] == 'b')
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continue;
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else
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{
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errno = EINVAL;
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return nullptr;
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}
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}
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int fd = open(pathname, flags);
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if (fd == -1)
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return nullptr;
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for (int i = 0; i < FOPEN_MAX; i++)
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{
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if (s_files[i].fd == -1)
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{
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s_files[i] = { .fd = fd };
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return &s_files[i];
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}
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}
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errno = EMFILE;
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return nullptr;
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}
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int fprintf(FILE* file, const char* format, ...)
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{
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va_list arguments;
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va_start(arguments, format);
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int ret = vfprintf(file, format, arguments);
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va_end(arguments);
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return ret;
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}
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int fputc(int c, FILE* file)
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{
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file->buffer[file->buffer_index++] = c;
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file->offset++;
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if (c == '\n' || file->buffer_index == sizeof(file->buffer))
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if (fflush(file) == EOF)
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return EOF;
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return (unsigned char)c;
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}
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int fputs(const char* str, FILE* file)
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{
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while (*str)
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{
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if (putc(*str, file) == EOF)
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return EOF;
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str++;
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}
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return 0;
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}
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size_t fread(void* buffer, size_t size, size_t nitems, FILE* file)
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{
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if (file->eof || nitems * size == 0)
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return 0;
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long ret = syscall(SYS_READ, file->fd, buffer, size * nitems);
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if (ret < 0)
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{
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errno = -ret;
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file->error = true;
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return 0;
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}
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if (ret < size * nitems)
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file->eof = true;
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file->offset += ret;
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return ret / size;
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}
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// TODO
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FILE* freopen(const char*, const char*, FILE*);
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// TODO
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int fscanf(FILE*, const char*, ...);
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int fseek(FILE* file, long offset, int whence)
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{
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return fseeko(file, offset, whence);
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}
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int fseeko(FILE* file, off_t offset, int whence)
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{
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if (whence == SEEK_CUR)
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file->offset += offset;
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else if (whence == SEEK_SET)
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file->offset = offset;
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else if (whence == SEEK_END)
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{
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errno = ENOTSUP;
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return -1;
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}
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else
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{
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errno = EINVAL;
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return -1;
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}
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if (file->offset < 0)
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{
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file->offset -= offset;
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errno = EINVAL;
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return -1;
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}
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if (long ret = syscall(SYS_SEEK, file->fd, file->offset); ret < 0)
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{
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errno = -ret;
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return -1;
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}
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file->eof = false;
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return 0;
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}
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int fsetpos(FILE* file, const fpos_t* pos)
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{
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return fseek(file, *pos, SEEK_SET);
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}
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long ftell(FILE* file)
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{
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return ftello(file);
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}
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off_t ftello(FILE* file)
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{
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return file->offset;
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}
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// TODO
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int ftrylockfile(FILE*);
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// TODO
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void funlockfile(FILE*);
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size_t fwrite(const void* buffer, size_t size, size_t nitems, FILE* file)
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{
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unsigned char* ubuffer = (unsigned char*)buffer;
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for (size_t byte = 0; byte < nitems * size; byte++)
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if (fputc(ubuffer[byte], file) == EOF)
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return byte / size;
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return nitems;
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}
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int getc(FILE* file)
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{
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return fgetc(file);
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}
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int getchar(void)
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{
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return getc(stdin);
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}
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// TODO
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int getc_unlocked(FILE*);
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// TODO
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int getchar_unlocked(void);
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char* gets(char* buffer)
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{
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if (stdin->eof)
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return nullptr;
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unsigned char* ubuffer = (unsigned char*)buffer;
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int first = fgetc(stdin);
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if (first == EOF)
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return nullptr;
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*ubuffer++ = first;
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for (;;)
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{
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int c = fgetc(stdin);
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if (c == '\n' || c == EOF)
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{
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*ubuffer++ = '\0';
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return buffer;
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}
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*ubuffer++ = c;
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}
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}
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// TODO
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int pclose(FILE*);
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void perror(const char* string)
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{
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if (string && *string)
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{
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fputs(string, stderr);
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fputs(": ", stderr);
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}
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fputs(strerror(errno), stderr);
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fputc('\n', stderr);
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stderr->error = true;
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}
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// TODO
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FILE* popen(const char*, const char*);
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int printf(const char* format, ...)
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{
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va_list arguments;
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va_start(arguments, format);
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int ret = vfprintf(stdout, format, arguments);
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va_end(arguments);
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return ret;
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}
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int putc(int c, FILE* file)
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{
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return fputc(c, file);
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}
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int putchar(int c)
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{
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return putc(c, stdout);
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}
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// TODO
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int putc_unlocked(int, FILE*);
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// TODO
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int putchar_unlocked(int);
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int puts(const char* string)
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{
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if (fputs(string, stdout) == EOF)
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return EOF;
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if (fputc('\n', stdout) == EOF)
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return EOF;
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return 0;
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}
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// TODO
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int remove(const char*);
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// TODO
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int rename(const char*, const char*);
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// TODO
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void rewind(FILE*);
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// TODO
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int scanf(const char*, ...);
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// TODO
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void setbuf(FILE*, char*);
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// TODO
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int setvbuf(FILE*, char*, int, size_t);
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// TODO
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int snprintf(char*, size_t, const char*, ...);
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// TODO
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int sprintf(char*, const char*, ...);
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// TODO
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int sscanf(const char*, const char*, ...);
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// TODO
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char* tempnam(const char*, const char*);
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// TODO
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FILE* tmpfile(void);
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// TODO
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char* tmpnam(char*);
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// TODO
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int ungetc(int, FILE*);
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int vfprintf(FILE* file, const char* format, va_list arguments)
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{
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int written = 0;
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while (*format)
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{
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if (*format == '%')
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{
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format++;
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switch (*format)
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{
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case '%':
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break;
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case 's':
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{
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const char* string = va_arg(arguments, const char*);
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if (fputs(string, file) == EOF)
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return -1;
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written += strlen(string);
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format++;
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break;
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}
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default:
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break;
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}
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}
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if (fputc(*format, file) == EOF)
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return -1;
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written++;
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format++;
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}
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return written;
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}
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// TODO
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int vfscanf(FILE*, const char*, va_list);
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int vprintf(const char* format, va_list arguments)
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{
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return vfprintf(stdout, format, arguments);
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}
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// TODO
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int vscanf(const char*, va_list);
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// TODO
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int vsnprintf(char*, size_t, const char*, va_list);
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// TODO
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int vsprintf(char*, const char*, va_list);
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// TODO
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int vsscanf(const char*, const char*, va_list);
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